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"It's just that I feel very comfortable at 6-minute pace," he says. "Much slower than that and I feel like I am working and breathing harder, and I begin to lose form and rhythm in my running."
when i was getting that mild heat distress after tennis last month i started putting frozen peas on the back of my neck after i got home. seemed to help. ymmv.
Galloway's Book on Running (1984) has a chart called "Adjusting race pace for heat".
Estimated temperature at finish...Slower than goal pace
55-60 degrees.....1%
60-65 degrees.....3%
65-70 degrees.....5%
70-75 degrees.....7%
75-80 degrees.....12%
80-85 degrees.....20%
above 85.....forget it, run for fun
He attaches a note: "This chart is based upon my own experience in the heat and talking to other runners. It has no scientific verification, but I think you get the general idea."
For each performance level the speed decrease associated with temperature increase and decrease is presented in supplementary data (Table S3).
For example the optimal temperature at which women's P1 maximal running speed was attained was 9.9°C, and an increase of 1°C from this optimal temperature will result in a speed loss of 0.03%. The optimal temperatures to run at maximal speed for men and women, varied from 3.8°C to 9.9°C according to each level of performance (Table S3).
Warmer air temperatures were associated with higher percentages of runners' withdrawal during a race (Figure 4). After testing linear, quadratic, exponential and logarithmic fits, the quadratic equation was the best fit (r2 = 0.36; p<0.0001) for modelling the percentage of runners withdrawals associated with air temperature
Let's say your athlete has previously turned in a 3:00 marathon in cool temperatures (40 degrees F). Today's race day dawns with a WBGT temperature of 60 degrees F (15 C). Based on this research, it's reasonable to anticipate they'll be about 6% slower than they would be at around 40F. If you do the math for your 3:00 marathoner, you'll find it changes the anticipated finish time to about a 3:10. Pace per mile should be adjusted from the "planned" 6:52 to a more realistic 7:17. Failure to take the environmental conditions into account will likely come with a penalty later in the race!
Finally, a 2012 study examining the drinking behaviors of elite male marathoners found that Haile Gebreselassie lost a whopping 9.8 percent of his bodyweight during the 2009 Dubai Marathon—and still won, in 2:05:29.
The cyclists who were heat acclimated performed anywhere from 4 to 8 percent better than they had before they trained in the heat, while the control group did not improve at all.

Nice work!
true 6RM to 6x6 in a week is solid. Just getting more confident with heavier loads on your back can make a huge difference in itself .. If it feels lighter on your back (because of halfs/quarters), then that can be a huge mental boost.. and those partial ROM squats are still targeting the same musculature. win win.